Heat exchangers with spring-twisted heat-exchange elements made of wire with sections of various geometries

Abstract

Abstract The use of heat exchangers in the industry is quite large, it makes up a large share of all heat consumption in Russia, and therefore it is important to have equipment that meets modern requirements. In this regard, there are issues of improving and modernizing obsolete and developing new equipment. The authors proposed a heat exchanger based on effective thermal elements, the working surface of which is made by tightly winding wire having a cross-section in the form of an ovoid on a circular cylinder. In the places where the coils of wire adjoin each other, they are rigidly coupled by means of microplasma or laser welding, which eliminates the phenomenon of work hardening taking place in knurled pipes. To justify the effectiveness of the proposed apparatus, a computer model of the heat transfer process was applied and a physical experiment of the installation was carried out, showing the adequacy of the computer model. Numerical results of heat and hydrodynamic characteristics showed the consistency of the application of the proposed heat exchange equipment, based on spring-twisted elements, in industry, in the field of housing and communal services, as well as in related industries. Research in this direction contributes to the creation of small-sized heat-exchange equipment of large unit capacity.